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ActivePMU

I

ACT8712

Product Brief, 03-Feb-08

Advanced Information―All Information Subject to Change

Four Channel Integrated Power Management IC

for Handheld Portable Equipment

SYSTEM BLOCK DIAGRAM

FEATURES

− ON/OFF Control and Status Indication

− 550mA Step-Down DC/DC

− 750mA Step-Down DC/DC

− Step-Up DC/DC with OVP for WLED Bias

− Programmable Output Voltages

− Configurable Operating Modes

− Programmable Charger Current

− Only 0.75mm Height

− RoHS Compliant

APPLICATIONS

GENERAL DESCRIPTION

The patent-pending ACT8712 is a complete, cost

agement solution that is ideal for a wide range of

portable hand held equipment. This device inte-

grates two PWM step-down DC/DC converters, one

PWM step-up DC/DC converter with over-voltage

protection (OVP) and

a full-featured linear-mode

Li+ battery charger into a single, thin, space-saving

mability for the DC/DC converters and battery

charger.

REG1 and REG2 are fixed-frequency, current-mode

PWM step-down DC/DC converters that are opti-

mized for high efficiency and are capable of supply-

ing up to 550mA and 750mA, respectively. REG3 is

a fixed-frequency PWM step-up converter that

safely and efficiently biases a string of up to seven

white-LEDs for backlighting. The battery charger

incorporates an internal power MOSFET for con-

stant-current/constant-voltage, thermally regulated

charging of a single-cell Li+ battery. All DC/DC con-

verters’ output voltage and charger current are pro-

The ACT8712 is available in a tiny 4mm x 4mm

24-pin Thin-QFN package that is just 0.75mm thin.

nRSTO

OUT2

1.1V to 4.4V

Up to 750mA

ON1

VIN

nMSTR

CHGLEV

Battery

Programmable

Up to 1A

OUT3

WLED Bias

nIRQ

OUT1

1.1V to 4.4V

Up to 550mA

ON2

nSTAT

ACT8712

REG3

Step-Up

DC/DC

Single Cell

Li+ Battery

Charger

System

Control

REG2

Step-Down

DC/DC

REG1

Step-Down

DC/DC

SCL

SDA

PMU

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